﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApplication1
{
    abstract class Number
    {

        public double real_part
        {
            get { return real_part; }
            set { real_part = value; }
        }

        public abstract double imaginary_part { get; set; }
        public abstract string Tostring();


    }
}
